Burton, Hester
Castors away! / Hester Burton
Oxford University Press , 1962
Buku Teks
Hudson, W.H.
Far away and long ago
New York E.P. Dutton & Co 1947
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When the boss is away ...
Artikel Jurnal
Hopgood, Alan
And the big men fly
Heinemann Educational Australia, 1969
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Goldsmith, Donald
The Run away universe : the race to find the future of the cosmos
Perseus Books, 2000
Buku Teks